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28 November, 04:38

Identify a1 and r for the sum of the geometric series.

-4, 8, - 16, 32, ...

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  1. 28 November, 12:21
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    A₁ is very clear, just the first term, namely - 4.

    now, "r" or the common ratio, for a geometric serie/sequence, you can always tease it out by simply getting the quotient of the "next term by the previous term", in this case, say 8 / (-4), or (-16) / 8 and so on.

    recall that a geometric sequence is done by using the common ratio to get the next term, thus the quotient of both terms is, yes, you guessed it, is "r", the common ratio.
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